MAS -
My construction financing is a a 5% simple interest loan. I pay interest on the draws as we go along. When I was looking for a lender, I found 1 place that had a lower interim rate, but they charged a much higher origination fee. In the end, I went with my local hometown bank. Zero origination fee on the construction loan. And I saw places with as high as 1% on the origination. Thats a pretty big chunk if you're building a custom build in the $180/sq ft range.
Haven't locked in my long term financing yet. For long term, I've got 2 lenders that I'm going to let duel it out as we get close to wrapping up this winter. Even with rate movement, I'm hopeful to be in the mid 4s for 15. This is a jumbo.
Unfortunately I'm a bit limited in the number of lenders who will take me to perm. Our property has a historic family cemetery with a built in visitation easement on the plat. Its not an active cemetery, in the sense that no more people will be buried there. "Newest" headstone is from the late 1800s. And no one has visited in over 40 years, but that visitation easement gives lenders heart palpitations and sweaty palms. It doesn't fit in their nice little financing box. I've given my info to 5 or 6 lenders, and the majority get back to me with "we could probably do it, but you won't like our terms...".
Anyway - if you have a normal piece of property and house, you shouldn't have any issues. My recommendation is to find someone you can use for construction and perm. It cuts down on fees bc every wants to do a front end survey and appraisal - and if you use the same lenders for perm, they might be willing to re-use the survey, cut back on your fees, and save you some dough.